2785257979 has 16 divisors (see below), whose sum is σ = 3325137408. Its totient is φ = 2281099392.

The previous prime is 2785257973. The next prime is 2785257997. The reversal of 2785257979 is 9797525872.

It is a cyclic number.

It is not a de Polignac number, because 2785257979 - 2⁵ = 2785257947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2785257973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148444 + ... + 166150.

It is an arithmetic number, because the mean of its divisors is an integer number (207821088).

Almost surely, 2^2785257979 is an apocalyptic number.

2785257979 is a deficient number, since it is larger than the sum of its proper divisors (539879429).

2785257979 is a wasteful number, since it uses less digits than its factorization.

2785257979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18714.

The product of its digits is 22226400, while the sum is 61.

The square root of 2785257979 is about 52775.5433794859. The cubic root of 2785257979 is about 1406.9817871080.

The spelling of 2785257979 in words is "two billion, seven hundred eighty-five million, two hundred fifty-seven thousand, nine hundred seventy-nine".